Rapid Electrical Stimulation Research Articles

Treatment of supraventricular tachycardias by rapid atrial stimulation.

In 10 patients, 24 episodes of supraventricular tachycardia were treated by rapid electrical stimulation of the right atrium. One episode of sinus tachycardia, eight episodes of atrial tachycardia, two episodes of atrial flutter, and 13 episodes of A-V junctional tachycardia occurred. In each case the diagnosis of the arrhythmia was documented by obtaining unipolar and bipolar intra-atrial electrograms. In three cases of supraventricular tachycardia the ventricular rate was slowed as a result of an increased atrial rate. The increased atrial rate caused an increase of the functional refractory period of the A-V junction, and thus, fewer atrial impulses were transmitted to the ventricles. In seven cases, 21 episodes of supraventricular tachycardia were terminated by rapid atrial stimulation. In six of these cases the tachycardia was converted to normal sinus rhythm either during or shortly after atrial stimulation. In one case, 12 episodes of A-V junctional tachycardia were converted to rhythms varying between normal sinus rhythm and a slow A-V junctional rhythm. In this case, after termination of the last episode of A-V junctional tachycardia, the rhythm was stabilized by atrial pacing.

Digitalis Administration During Ventricular Tachycardia.

s1 November 1965Digitalis Administration During Ventricular Tachycardia.Gerald H. Whipple, M.D. (Associate), Sidney Friedman, M.D.Gerald H. Whipple, M.D. (Associate)Search for more papers by this author, Sidney Friedman, M.D.Search for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-63-5-903_2 SectionsAboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail ExcerptThis study analyzed the effect of a single dose of a rapidly acting digitalis preparation on hemodynamic parameters during continuing ventricular tachycardia and on the time required for "hemodynamic recovery" from congestive circulatory failure induced by chronic rapid electrical stimulation of the ventricles of intact dogs. Stimulation electrodes were attached to the right ventricles; chronic indwelling catheters were placed in the aorta, pulmonary artery, and right and left atria to permit determination of cardiac output, circulation time, pressures and various abstracted parameters. Congestive failure was induced in nine animals by stimulation rates ranging from 280 to 310 beats/min for an... This content is PDF only. To continue reading please click on the PDF icon. Author, Article, and Disclosure InformationAffiliations: Boston, Massachusetts PreviousarticleNextarticle Advertisement FiguresReferencesRelatedDetails Metrics 1 November 1965Volume 63, Issue 5Page: 903-903KeywordsAortaCardiac outputCathetersHemodynamicsPulmonary arteriesVentricular tachycardia Issue Published: 1 November 1965 PDF downloadLoading ...

On the relation of blood-volume to the nutrition of the tissues. III. The effects of hemorrhage and subsequent injection of gumsaline upon the response of the sartorius muscle of the dog to rapid electrical stimulation

By comparing fatigue curves elicited by equal periods of stimulation of the sartorius muscle, we found that hemorrhage had a detrimental effect upon the endurance of the muscle, that hemorrhage amounting to 1 per cent. of the body weight or less may decrease the response of the muscle to stimulation. Subsequent injection of gum-saline decidedly improved the response of the muscle to further stimulation.

Muscular Contraction following rapid Electrical Stimulation of Central Nervous System

(Abstract)Kronecker, Hall, Schäfer, Horsley, and others have found, when stimulating the spinal cord with rapid induced currents (ten, twenty, thirty, forty times per second), that the muscles always responded by giving a curve showing oscillations of one invariable period, no matter what the period of the stimulation may have been. With rapid stimulation, the muscles in the hands of the first named observers gave oscillations of twenty a second, in the hands of the latter observers of ten a second. These results are to be explained in the following way. When the central nervous system is stimulated, the muscles contract but never smoothly, for local fascicular movement, as the author has elsewhere shown, always occurring. These cause the registering apparatus to oscillate at its own period, just as any swinging body may be kept in motion by occasional disturbances. We can thus explain how each observer obtained the same number of oscillations every time he stimulated the nervous system; it was because he used the same recording apparatus each time. We can also see that the different periods observed by different observers are due to the fact that they each used a different recording apparatus. The author finds that on changing the recording apparatus (lever or tambour) the tracing obtained can be changed at will, and is practically a tracing of the oscillating period of the instrument used.

A Note on the Cause of the Failure of very rapid Electrical Stimulation to produce Tetanus in Muscle

A Note on the Cause of the Failure of very rapid Electrical Stimulation to produce Tetanus in Muscle